18071367720 has 256 divisors, whose sum is σ = 65326141440. Its totient is φ = 3909869568.

The previous prime is 18071367701. The next prime is 18071367749. The reversal of 18071367720 is 2776317081.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1869219 + ... + 1878861.

It is an arithmetic number, because the mean of its divisors is an integer number (255180240).

Almost surely, 2^18071367720 is an apocalyptic number.

18071367720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18071367720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32663070720).

18071367720 is an abundant number, since it is smaller than the sum of its proper divisors (47254773720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18071367720 is a wasteful number, since it uses less digits than its factorization.

18071367720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9784 (or 9780 counting only the distinct ones).

The product of its (nonzero) digits is 98784, while the sum is 42.

The spelling of 18071367720 in words is "eighteen billion, seventy-one million, three hundred sixty-seven thousand, seven hundred twenty".